1pc MAX7219 8*8 Dot Matrix LED Display Module, 3MM 1088AS Common cathode Digital Tube For Arduino DIY KIT

MAX7219 dot matrix module microcontroller 8*8 dot matrix display module blue green red 3MM 8*8 common cathode dot matrix module

Made of high quality material and with fine workmanship, these modules are with high strength and durable for long-term use. They are also stable and reliable on performance for professional design. Suitable use for development and application.

Features

High quality and durable in use

Easy to install and use

Stable and reliable performance

The size chart is as follows: the pin length is about 3MM

The sequence diagram of the pins is as follows:

1. The main characteristics of commonly used small light-emitting diodes:

① LED is a unidirectional conductive device. Only current is allowed to flow from the positive pole to the negative pole. It turns on and emits light only when it is connected in the forward direction. Reverse access is blocked. Of course it doesn't shine either. This is similar to ordinary diodes. However, the tube voltage drop of light-emitting diodes is larger than that of ordinary diodes, about 2V, and the power supply voltage must be greater than the tube voltage drop for the light-emitting diodes to work.

② The brightness of the light-emitting diode is related to its working current If, generally when If=1mA, it starts to glow. With the increase of lf the brightness increases continuously. But when lf ≥ 5mA later. The brightness increase is not significant. In addition, the maximum working current of the light-emitting diode is generally 20-30mA, exceeding this value will damage the light-emitting diode. Therefore, the working current lF should be selected within the range of 5-20mA, and in order to save electric energy, generally choose lf=5mA.

③ The reverse breakdown voltage of light-emitting diodes is generally around 5V. In use, the light-emitting diode should not be subjected to a reverse voltage exceeding 5V. Otherwise, the LED will be broken down and damaged.